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An international team of researchers, led by Durham University (UK) and the China Agricultural University, in Beijing, say their findings suggest a difference between patterns of early domestication and movement of pigs in Europe and parts of East Asia.

The research, published April 19 in the Proceedings of the National Academy of Sciences USA, looked at the DNA sequences of more than 1,500 modern and 18 ancient pigs.

Lead author Dr Greger Larson, in the Department of Archaeology, at Durham University, said: "Previous studies of European domestic pigs demonstrated that the first pigs in Europe were imported from the Near East. Those first populations were then completely replaced by pigs descended from European wild boar.

"However, despite the occurrence of genetically distinct populations of wild boar throughout modern China, these populations have not been incorporated into domestic stocks.

"The earliest known Chinese domestic pigs have a direct connection with modern Chinese breeds, suggesting a long, unbroken history of pigs and people in this part of East Asia."

The finding is part of a wider research project into pig domestication and early human migration in East Asia.

The study also uncovered multiple centres of pig domestication and a complex picture of human migration across East Asia.

After pigs were incorporated into domestic stocks in Southeast Asia, the animals then migrated with people south and east to New Guinea, eventually reaching the remote Pacific, including Hawai'i, Tahiti, and Fiji, the researchers said.

The DNA analysis also found that wild boar were probably domesticated in many places including India and peninsular Southeast Asia several thousand years ago.

As current interpretations of archaeological records in these regions do not yet support these findings, the group has referred to them as "cryptic domestications."

They suggest that additional archaeological digs and new analytical techniques may help to resolve the problem.

Dr Larson added: "Our evidence suggests an intriguingly complex pattern of local domestication and regional turnover and calls for a reappraisal of the archaeological record across South and East Asia.

"We may even find additional centres of pig domestication when we take a closer look at the picture in that part of the world."

The research is part of an ongoing research project based at Durham University which aims to re-evaluate the archaeological evidence for pig domestication and husbandry and explore the role of animals in reconstructing ancient human migration, trade and exchange networks.

The DNA testing was carried out at the China Agricultural University and was analysed at Durham University and Uppsala University, Sweden.

The research was funded by the National Basic Research Programme of China and the National Key Technology R&D Programme of China.

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